Liu T. 2010 中微子冷却盘进动可能是伽马暴光变的原因

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Title:		Jet precession driven by neutrino-cooled disk for gamma-ray bursts
Authors:		Liu, T.; Liang, E.-W.; Gu, W.-M.; Zhao, X.-H.; Dai, Z.-G.; Lu, J.-F.
Affiliation:		AA(Department of Astronomy, Nanjing University, Nanjing,Jiangsu 210093, PR China tongliu@nju.edu.cn), AB(Department of Physics, GuangxiUniversity, Nanning, Guangxi, 530004, PR China), AC(Department ofPhysics and Institute of Theoretical Physics and Astrophysics,Xiamen University, Xiamen, Fujian 361005, PR China), AD(NationalAstronomical Observatories/Yunnan Observatory, Chinese Academy ofSciences, Kunming, Yunnan, 650011, PR China ; Key Laboratory for theStructure and Evolution of Celestial Bodies, Chinese Academy ofSciences, Kunming, Yunnan, 650011, PR China), AE(Department of Astronomy, Nanjing University, Nanjing,Jiangsu 210093, PR China ), AF(Department ofPhysics and Institute of Theoretical Physics and Astrophysics,Xiamen University, Xiamen, Fujian 361005, PR China)
Publication:		Astronomy and Astrophysics, Volume 516, id.A16 (A&A Homepage)
Publication Date:		06/2010
Origin:		EDP Sciences
Keywords:		accretion: accretion disks, black hole physics, gamma ray burst: general
DOI:		10.1051/0004-6361/200913447
Bibliographic Code:		2010A&A...516A..16L

Abstract

Aims: A model of jet precession driven by a neutrino-cooled disk around a spinning black hole is presented to explain the temporal structure and spectral evolution of gamma-ray bursts (GRBs).
Methods: The differential rotation of the outer part of a neutrino-dominated accretion disk may result in precession of the inner part of the disk and the central black hole, hence driving a precessed jet via neutrino annihilation around the inner part of the disk.
Results: Both analytic and numeric results for our model are presented. Our calculations show that a black-hole, accretion-disk system with the black hole mass M ≃ 3.66 M_ȯ, accretion rate dot{M} ≃ 0.54 M_ȯ s^-1, spin parameter a = 0.9, and viscosity parameter α = 0.01 may drive a precessed jet with period P = 1 s and luminosity L = 10⁵¹ erg s^-1, corresponding to the scenario for long GRBs. A precessed jet with P = 0.1 s and L = 10⁵⁰ erg s^-1 may be powered by a system with M ≃ 5.59 M_ȯ, dot{M} ≃ 0.74 M_ȯ s^-1, a = 0.1, and α = 0.01, and is possibly responsible for the short GRBs. Both the temporal and spectral evolution in GRB pulse may be explained with our model.
Conclusions: GRB central engines most likely power a precessed jet driven by a neutrino-cooled disk. The global GRB lightcurves thus could be modulated by the jet precession during the accretion timescale of the GRB central engine. Both the temporal and spectral evolution in GRB pulse may stem from a viewing effect of the jet precession.

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